public  class Example2_2 { 

   public static void main (String args[]) {

      byte b = 22; 

      int  n = 129;  

      float f =123456.6789f ;

      double d=123456789.123456789;

      System.out.println("b=  "+b);   

      System.out.println("n=  "+n);

      System.out.println("f=  "+f);   

      System.out.println("d=  "+d); 

      b=(byte)n;    //导致精度的损失.

      f=(float)d;   //导致精度的损失

      System.out.println("b=  "+b);   

      System.out.println("f=  "+f); 

   }

}
